cpustats/cpustats.c - platform/system/extras - Git at Google

 /*
  * Copyright (c) 2012, The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  * Neither the name of Google, Inc. nor the names of its contributors
  *    may be used to endorse or promote products derived from this
  *    software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>

 #define MAX_BUF_SIZE 64

 struct freq_info {
     unsigned freq;
     long unsigned time;
 };

 struct cpu_info {
     long unsigned utime, ntime, stime, itime, iowtime, irqtime, sirqtime;
     struct freq_info *freqs;
     int freq_count;
 };

 #define die(...) { fprintf(stderr, __VA_ARGS__); exit(EXIT_FAILURE); }

 static struct cpu_info old_total_cpu, new_total_cpu, *old_cpus, *new_cpus;
 static int cpu_count, delay, iterations;
 static char minimal, aggregate_freq_stats;

 static int get_cpu_count();
 static int get_cpu_count_from_file(char *filename);
 static long unsigned get_cpu_total_time(struct cpu_info *cpu);
 static int get_freq_scales_count(int cpu);
 static void print_stats();
 static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu,
         char print_freq);
 static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu);
 static void read_stats();
 static void read_freq_stats(int cpu);
 static char should_aggregate_freq_stats();
 static char should_print_freq_stats();
 static void usage(char *cmd);

 int main(int argc, char *argv[]) {
     struct cpu_info *tmp_cpus, tmp_total_cpu;
     int i, freq_count;

     delay = 3;
     iterations = -1;
     minimal = 0;
     aggregate_freq_stats = 0;

     for (i = 0; i < argc; i++) {
         if (!strcmp(argv[i], "-n")) {
             if (i + 1 >= argc) {
                 fprintf(stderr, "Option -n expects an argument.\n");
                 usage(argv[0]);
                 exit(EXIT_FAILURE);
             }
             iterations = atoi(argv[++i]);
             continue;
         }
         if (!strcmp(argv[i], "-d")) {
             if (i + 1 >= argc) {
                 fprintf(stderr, "Option -d expects an argument.\n");
                 usage(argv[0]);
                 exit(EXIT_FAILURE);
             }
             delay = atoi(argv[++i]);
             continue;
         }
         if (!strcmp(argv[i], "-m")) {
             minimal = 1;
         }
         if (!strcmp(argv[i], "-h")) {
             usage(argv[0]);
             exit(EXIT_SUCCESS);
         }
     }

     cpu_count = get_cpu_count();

     old_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
     if (!old_cpus) die("Could not allocate struct cpu_info\n");
     new_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
     if (!new_cpus) die("Could not allocate struct cpu_info\n");

     for (i = 0; i < cpu_count; i++) {
         old_cpus[i].freq_count = new_cpus[i].freq_count = get_freq_scales_count(i);
         new_cpus[i].freqs = malloc(sizeof(struct freq_info) * new_cpus[i].freq_count);
         if (!new_cpus[i].freqs) die("Could not allocate struct freq_info\n");
         old_cpus[i].freqs = malloc(sizeof(struct freq_info) * old_cpus[i].freq_count);
         if (!old_cpus[i].freqs) die("Could not allocate struct freq_info\n");
     }

     // Read stats without aggregating freq stats in the total cpu
     read_stats();

     aggregate_freq_stats = should_aggregate_freq_stats();
     if (aggregate_freq_stats) {
         old_total_cpu.freq_count = new_total_cpu.freq_count = new_cpus[0].freq_count;
         new_total_cpu.freqs = malloc(sizeof(struct freq_info) * new_total_cpu.freq_count);
         if (!new_total_cpu.freqs) die("Could not allocate struct freq_info\n");
         old_total_cpu.freqs = malloc(sizeof(struct freq_info) * old_total_cpu.freq_count);
         if (!old_total_cpu.freqs) die("Could not allocate struct freq_info\n");

         // Read stats again with aggregating freq stats in the total cpu
         read_stats();
     }

     while ((iterations == -1) || (iterations-- > 0)) {
         // Swap new and old cpu buffers;
         tmp_total_cpu = old_total_cpu;
         old_total_cpu = new_total_cpu;
         new_total_cpu = tmp_total_cpu;

         tmp_cpus = old_cpus;
         old_cpus = new_cpus;
         new_cpus = tmp_cpus;

         sleep(delay);
         read_stats();
         print_stats();
     }

     // Clean up
     if (aggregate_freq_stats) {
         free(new_total_cpu.freqs);
         free(old_total_cpu.freqs);
     }
     for (i = 0; i < cpu_count; i++) {
         free(new_cpus[i].freqs);
         free(old_cpus[i].freqs);
     }
     free(new_cpus);
     free(old_cpus);

     return 0;
 }

 /*
  * Get the number of CPUs of the system.
  *
  * Uses the two files /sys/devices/system/cpu/present and
  * /sys/devices/system/cpu/online to determine the number of CPUs. Expects the
  * format of both files to be either 0 or 0-N where N+1 is the number of CPUs.
  *
  * Exits if the present CPUs is not equal to the online CPUs
  */
 static int get_cpu_count() {
     int cpu_count = get_cpu_count_from_file("/sys/devices/system/cpu/present");
     if (cpu_count != get_cpu_count_from_file("/sys/devices/system/cpu/online")) {
         die("present cpus != online cpus\n");
     }
     return cpu_count;
 }

 /*
  * Get the number of CPUs from a given filename.
  */
 static int get_cpu_count_from_file(char *filename) {
     FILE *file;
     char line[MAX_BUF_SIZE];
     int cpu_count;

     file = fopen(filename, "r");
     if (!file) die("Could not open %s\n", filename);
     if (!fgets(line, MAX_BUF_SIZE, file)) die("Could not get %s contents\n", filename);
     fclose(file);

     if (strcmp(line, "0\n") == 0) {
         return 1;
     }

     if (1 == sscanf(line, "0-%d\n", &cpu_count)) {
         return cpu_count + 1;
     }

     die("Unexpected input in file %s (%s).\n", filename, line);
     return -1;
 }

 /*
  * Get the number of frequency states a given CPU can be scaled to.
  */
 static int get_freq_scales_count(int cpu) {
     FILE *file;
     char filename[MAX_BUF_SIZE];
     long unsigned freq;
     int count = 0;

     sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
     file = fopen(filename, "r");
     if (!file) die("Could not open %s\n", filename);
     do {
         freq = 0;
         fscanf(file, "%lu %*d\n", &freq);
         if (freq) count++;
     } while(freq);
     fclose(file);

     return count;
 }

 /*
  * Read the CPU and frequency stats for all cpus.
  */
 static void read_stats() {
     FILE *file;
     char scanline[MAX_BUF_SIZE];
     int i;

     file = fopen("/proc/stat", "r");
     if (!file) die("Could not open /proc/stat.\n");
     fscanf(file, "cpu  %lu %lu %lu %lu %lu %lu %lu %*d %*d %*d\n",
            &new_total_cpu.utime, &new_total_cpu.ntime, &new_total_cpu.stime, &new_total_cpu.itime,
            &new_total_cpu.iowtime, &new_total_cpu.irqtime, &new_total_cpu.sirqtime);
     if (aggregate_freq_stats) {
         for (i = 0; i < new_total_cpu.freq_count; i++) {
             new_total_cpu.freqs[i].time = 0;
         }
     }

     for (i = 0; i < cpu_count; i++) {
         sprintf(scanline, "cpu%d %%lu %%lu %%lu %%lu %%lu %%lu %%lu %%*d %%*d %%*d\n", i);
         fscanf(file, scanline, &new_cpus[i].utime, &new_cpus[i].ntime, &new_cpus[i].stime,
                &new_cpus[i].itime, &new_cpus[i].iowtime, &new_cpus[i].irqtime,
                &new_cpus[i].sirqtime);
         read_freq_stats(i);
     }
     fclose(file);
 }

 /*
  * Read the frequency stats for a given cpu.
  */
 static void read_freq_stats(int cpu) {
     FILE *file;
     char filename[MAX_BUF_SIZE];
     int i;

     sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
     file = fopen(filename, "r");
     if (!file) die("Could not open %s\n", filename);
     for (i = 0; i < new_cpus[cpu].freq_count; i++) {
         fscanf(file, "%u %lu\n", &new_cpus[cpu].freqs[i].freq,
                &new_cpus[cpu].freqs[i].time);
         if (aggregate_freq_stats) {
             new_total_cpu.freqs[i].freq = new_cpus[cpu].freqs[i].freq;
             new_total_cpu.freqs[i].time += new_cpus[cpu].freqs[i].time;
         }
     }
     fclose(file);
 }

 /*
  * Get the sum of the cpu time from all categories.
  */
 static long unsigned get_cpu_total_time(struct cpu_info *cpu) {
     return (cpu->utime + cpu->ntime + cpu->stime + cpu->itime + cpu->iowtime + cpu->irqtime +
             cpu->sirqtime);
 }

 /*
  * Print the stats for all CPUs.
  */
 static void print_stats() {
     char label[8];
     int i, j;
     char print_freq;

     print_freq = should_print_freq_stats();

     print_cpu_stats("Total", &new_total_cpu, &old_total_cpu, 1);
     for (i = 0; i < cpu_count; i++) {
         sprintf(label, "cpu%d", i);
         print_cpu_stats(label, &new_cpus[i], &old_cpus[i], print_freq);
     }
     printf("\n");
 }

 /*
  * Print the stats for a single CPU.
  */
 static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu,
         char print_freq) {
     long int total_delta_time;

     if (!minimal) {
         total_delta_time = get_cpu_total_time(new_cpu) - get_cpu_total_time(old_cpu);
         printf("%s: User %ld + Nice %ld + Sys %ld + Idle %ld + IOW %ld + IRQ %ld + SIRQ %ld = "
                 "%ld\n", label,
                 new_cpu->utime - old_cpu->utime,
                 new_cpu->ntime - old_cpu->ntime,
                 new_cpu->stime - old_cpu->stime,
                 new_cpu->itime - old_cpu->itime,
                 new_cpu->iowtime - old_cpu->iowtime,
                 new_cpu->irqtime - old_cpu->irqtime,
                 new_cpu->sirqtime - old_cpu->sirqtime,
                 total_delta_time);
         if (print_freq) {
             print_freq_stats(new_cpu, old_cpu);
         }
     } else {
         printf("%s,%ld,%ld,%ld,%ld,%ld,%ld,%ld", label,
                 new_cpu->utime - old_cpu->utime,
                 new_cpu->ntime - old_cpu->ntime,
                 new_cpu->stime - old_cpu->stime,
                 new_cpu->itime - old_cpu->itime,
                 new_cpu->iowtime - old_cpu->iowtime,
                 new_cpu->irqtime - old_cpu->irqtime,
                 new_cpu->sirqtime - old_cpu->sirqtime);
         print_freq_stats(new_cpu, old_cpu);
         printf("\n");
     }
 }

 /*
  * Print the CPU stats for a single CPU.
  */
 static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu) {
     long int delta_time, total_delta_time;
     int i;

     if (new_cpu->freq_count > 0) {
         if (!minimal) {
             total_delta_time = 0;
             printf("  ");
             for (i = 0; i < new_cpu->freq_count; i++) {
                 delta_time = new_cpu->freqs[i].time - old_cpu->freqs[i].time;
                 total_delta_time += delta_time;
                 printf("%ukHz %ld", new_cpu->freqs[i].freq, delta_time);
                 if (i + 1 != new_cpu->freq_count) {
                     printf(" + \n  ");
                 } else {
                     printf(" = ");
                 }
             }
             printf("%ld\n", total_delta_time);
         } else {
             for (i = 0; i < new_cpu->freq_count; i++) {
                 printf(",%u,%ld", new_cpu->freqs[i].freq,
                         new_cpu->freqs[i].time - old_cpu->freqs[i].time);
             }
         }
     }
 }

 /*
  * Determine if frequency stats should be printed.
  *
  * If the frequency stats are different between CPUs, the stats should be
  * printed for each CPU, else only the aggregate frequency stats should be
  * printed.
  */
 static char should_print_freq_stats() {
     int i, j;

     for (i = 1; i < cpu_count; i++) {
         for (j = 0; j < new_cpus[i].freq_count; j++) {
             if (new_cpus[i].freqs[j].time - old_cpus[i].freqs[j].time !=
                     new_cpus[0].freqs[j].time - old_cpus[0].freqs[j].time) {
                 return 1;
             }
         }
     }
     return 0;
 }

 /*
  * Determine if the frequency stats should be aggregated.
  *
  * Only aggregate the frequency stats in the total cpu stats if the frequencies
  * reported by all CPUs are identical.  Must be called after read_stats() has
  * been called once.
  */
 static char should_aggregate_freq_stats() {
     int i, j;

     for (i = 1; i < cpu_count; i++) {
         if (new_cpus[i].freq_count != new_cpus[0].freq_count) {
             return 0;
         }
         for (j = 0; j < new_cpus[i].freq_count; j++) {
             if (new_cpus[i].freqs[j].freq != new_cpus[0].freqs[j].freq) {
                 return 0;
             }
         }
     }

     return 1;
 }

 /*
  * Print the usage message.
  */
 static void usage(char *cmd) {
     fprintf(stderr, "Usage %s [ -n iterations ] [ -d delay ] [ -c cpu ] [ -m ] [ -h ]\n"
             "    -n num  Updates to show before exiting.\n"
             "    -d num  Seconds to wait between updates.\n"
             "    -m      Display minimal output.\n"
             "    -h      Display this help screen.\n",
             cmd);
 }
	/*
	* Copyright (c) 2012, The Android Open Source Project
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google, Inc. nor the names of its contributors
	* may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
	* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>

	#define MAX_BUF_SIZE 64

	struct freq_info {
	unsigned freq;
	long unsigned time;
	};

	struct cpu_info {
	long unsigned utime, ntime, stime, itime, iowtime, irqtime, sirqtime;
	struct freq_info *freqs;
	int freq_count;
	};

	#define die(...) { fprintf(stderr, __VA_ARGS__); exit(EXIT_FAILURE); }

	static struct cpu_info old_total_cpu, new_total_cpu, old_cpus, new_cpus;
	static int cpu_count, delay, iterations;
	static char minimal, aggregate_freq_stats;

	static int get_cpu_count();
	static int get_cpu_count_from_file(char *filename);
	static long unsigned get_cpu_total_time(struct cpu_info *cpu);
	static int get_freq_scales_count(int cpu);
	static void print_stats();
	static void print_cpu_stats(char label, struct cpu_info new_cpu, struct cpu_info *old_cpu,
	char print_freq);
	static void print_freq_stats(struct cpu_info new_cpu, struct cpu_info old_cpu);
	static void read_stats();
	static void read_freq_stats(int cpu);
	static char should_aggregate_freq_stats();
	static char should_print_freq_stats();
	static void usage(char *cmd);

	int main(int argc, char *argv[]) {
	struct cpu_info *tmp_cpus, tmp_total_cpu;
	int i, freq_count;

	delay = 3;
	iterations = -1;
	minimal = 0;
	aggregate_freq_stats = 0;

	for (i = 0; i < argc; i++) {
	if (!strcmp(argv[i], "-n")) {
	if (i + 1 >= argc) {
	fprintf(stderr, "Option -n expects an argument.\n");
	usage(argv[0]);
	exit(EXIT_FAILURE);
	}
	iterations = atoi(argv[++i]);
	continue;
	}
	if (!strcmp(argv[i], "-d")) {
	if (i + 1 >= argc) {
	fprintf(stderr, "Option -d expects an argument.\n");
	usage(argv[0]);
	exit(EXIT_FAILURE);
	}
	delay = atoi(argv[++i]);
	continue;
	}
	if (!strcmp(argv[i], "-m")) {
	minimal = 1;
	}
	if (!strcmp(argv[i], "-h")) {
	usage(argv[0]);
	exit(EXIT_SUCCESS);
	}
	}

	cpu_count = get_cpu_count();

	old_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
	if (!old_cpus) die("Could not allocate struct cpu_info\n");
	new_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
	if (!new_cpus) die("Could not allocate struct cpu_info\n");

	for (i = 0; i < cpu_count; i++) {
	old_cpus[i].freq_count = new_cpus[i].freq_count = get_freq_scales_count(i);
	new_cpus[i].freqs = malloc(sizeof(struct freq_info) * new_cpus[i].freq_count);
	if (!new_cpus[i].freqs) die("Could not allocate struct freq_info\n");
	old_cpus[i].freqs = malloc(sizeof(struct freq_info) * old_cpus[i].freq_count);
	if (!old_cpus[i].freqs) die("Could not allocate struct freq_info\n");
	}

	// Read stats without aggregating freq stats in the total cpu
	read_stats();

	aggregate_freq_stats = should_aggregate_freq_stats();
	if (aggregate_freq_stats) {
	old_total_cpu.freq_count = new_total_cpu.freq_count = new_cpus[0].freq_count;
	new_total_cpu.freqs = malloc(sizeof(struct freq_info) * new_total_cpu.freq_count);
	if (!new_total_cpu.freqs) die("Could not allocate struct freq_info\n");
	old_total_cpu.freqs = malloc(sizeof(struct freq_info) * old_total_cpu.freq_count);
	if (!old_total_cpu.freqs) die("Could not allocate struct freq_info\n");

	// Read stats again with aggregating freq stats in the total cpu
	read_stats();
	}

	while ((iterations == -1) \|\| (iterations-- > 0)) {
	// Swap new and old cpu buffers;
	tmp_total_cpu = old_total_cpu;
	old_total_cpu = new_total_cpu;
	new_total_cpu = tmp_total_cpu;

	tmp_cpus = old_cpus;
	old_cpus = new_cpus;
	new_cpus = tmp_cpus;

	sleep(delay);
	read_stats();
	print_stats();
	}

	// Clean up
	if (aggregate_freq_stats) {
	free(new_total_cpu.freqs);
	free(old_total_cpu.freqs);
	}
	for (i = 0; i < cpu_count; i++) {
	free(new_cpus[i].freqs);
	free(old_cpus[i].freqs);
	}
	free(new_cpus);
	free(old_cpus);

	return 0;
	}

	/*
	* Get the number of CPUs of the system.
	*
	* Uses the two files /sys/devices/system/cpu/present and
	* /sys/devices/system/cpu/online to determine the number of CPUs. Expects the
	* format of both files to be either 0 or 0-N where N+1 is the number of CPUs.
	*
	* Exits if the present CPUs is not equal to the online CPUs
	*/
	static int get_cpu_count() {
	int cpu_count = get_cpu_count_from_file("/sys/devices/system/cpu/present");
	if (cpu_count != get_cpu_count_from_file("/sys/devices/system/cpu/online")) {
	die("present cpus != online cpus\n");
	}
	return cpu_count;
	}

	/*
	* Get the number of CPUs from a given filename.
	*/
	static int get_cpu_count_from_file(char *filename) {
	FILE *file;
	char line[MAX_BUF_SIZE];
	int cpu_count;

	file = fopen(filename, "r");
	if (!file) die("Could not open %s\n", filename);
	if (!fgets(line, MAX_BUF_SIZE, file)) die("Could not get %s contents\n", filename);
	fclose(file);

	if (strcmp(line, "0\n") == 0) {
	return 1;
	}

	if (1 == sscanf(line, "0-%d\n", &cpu_count)) {
	return cpu_count + 1;
	}

	die("Unexpected input in file %s (%s).\n", filename, line);
	return -1;
	}

	/*
	* Get the number of frequency states a given CPU can be scaled to.
	*/
	static int get_freq_scales_count(int cpu) {
	FILE *file;
	char filename[MAX_BUF_SIZE];
	long unsigned freq;
	int count = 0;

	sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
	file = fopen(filename, "r");
	if (!file) die("Could not open %s\n", filename);
	do {
	freq = 0;
	fscanf(file, "%lu %*d\n", &freq);
	if (freq) count++;
	} while(freq);
	fclose(file);

	return count;
	}

	/*
	* Read the CPU and frequency stats for all cpus.
	*/
	static void read_stats() {
	FILE *file;
	char scanline[MAX_BUF_SIZE];
	int i;

	file = fopen("/proc/stat", "r");
	if (!file) die("Could not open /proc/stat.\n");
	fscanf(file, "cpu %lu %lu %lu %lu %lu %lu %lu %d %d %*d\n",
	&new_total_cpu.utime, &new_total_cpu.ntime, &new_total_cpu.stime, &new_total_cpu.itime,
	&new_total_cpu.iowtime, &new_total_cpu.irqtime, &new_total_cpu.sirqtime);
	if (aggregate_freq_stats) {
	for (i = 0; i < new_total_cpu.freq_count; i++) {
	new_total_cpu.freqs[i].time = 0;
	}
	}

	for (i = 0; i < cpu_count; i++) {
	sprintf(scanline, "cpu%d %%lu %%lu %%lu %%lu %%lu %%lu %%lu %%d %%d %%*d\n", i);
	fscanf(file, scanline, &new_cpus[i].utime, &new_cpus[i].ntime, &new_cpus[i].stime,
	&new_cpus[i].itime, &new_cpus[i].iowtime, &new_cpus[i].irqtime,
	&new_cpus[i].sirqtime);
	read_freq_stats(i);
	}
	fclose(file);
	}

	/*
	* Read the frequency stats for a given cpu.
	*/
	static void read_freq_stats(int cpu) {
	FILE *file;
	char filename[MAX_BUF_SIZE];
	int i;

	sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
	file = fopen(filename, "r");
	if (!file) die("Could not open %s\n", filename);
	for (i = 0; i < new_cpus[cpu].freq_count; i++) {
	fscanf(file, "%u %lu\n", &new_cpus[cpu].freqs[i].freq,
	&new_cpus[cpu].freqs[i].time);
	if (aggregate_freq_stats) {
	new_total_cpu.freqs[i].freq = new_cpus[cpu].freqs[i].freq;
	new_total_cpu.freqs[i].time += new_cpus[cpu].freqs[i].time;
	}
	}
	fclose(file);
	}

	/*
	* Get the sum of the cpu time from all categories.
	*/
	static long unsigned get_cpu_total_time(struct cpu_info *cpu) {
	return (cpu->utime + cpu->ntime + cpu->stime + cpu->itime + cpu->iowtime + cpu->irqtime +
	cpu->sirqtime);
	}

	/*
	* Print the stats for all CPUs.
	*/
	static void print_stats() {
	char label[8];
	int i, j;
	char print_freq;

	print_freq = should_print_freq_stats();

	print_cpu_stats("Total", &new_total_cpu, &old_total_cpu, 1);
	for (i = 0; i < cpu_count; i++) {
	sprintf(label, "cpu%d", i);
	print_cpu_stats(label, &new_cpus[i], &old_cpus[i], print_freq);
	}
	printf("\n");
	}

	/*
	* Print the stats for a single CPU.
	*/
	static void print_cpu_stats(char label, struct cpu_info new_cpu, struct cpu_info *old_cpu,
	char print_freq) {
	long int total_delta_time;

	if (!minimal) {
	total_delta_time = get_cpu_total_time(new_cpu) - get_cpu_total_time(old_cpu);
	printf("%s: User %ld + Nice %ld + Sys %ld + Idle %ld + IOW %ld + IRQ %ld + SIRQ %ld = "
	"%ld\n", label,
	new_cpu->utime - old_cpu->utime,
	new_cpu->ntime - old_cpu->ntime,
	new_cpu->stime - old_cpu->stime,
	new_cpu->itime - old_cpu->itime,
	new_cpu->iowtime - old_cpu->iowtime,
	new_cpu->irqtime - old_cpu->irqtime,
	new_cpu->sirqtime - old_cpu->sirqtime,
	total_delta_time);
	if (print_freq) {
	print_freq_stats(new_cpu, old_cpu);
	}
	} else {
	printf("%s,%ld,%ld,%ld,%ld,%ld,%ld,%ld", label,
	new_cpu->utime - old_cpu->utime,
	new_cpu->ntime - old_cpu->ntime,
	new_cpu->stime - old_cpu->stime,
	new_cpu->itime - old_cpu->itime,
	new_cpu->iowtime - old_cpu->iowtime,
	new_cpu->irqtime - old_cpu->irqtime,
	new_cpu->sirqtime - old_cpu->sirqtime);
	print_freq_stats(new_cpu, old_cpu);
	printf("\n");
	}
	}

	/*
	* Print the CPU stats for a single CPU.
	*/
	static void print_freq_stats(struct cpu_info new_cpu, struct cpu_info old_cpu) {
	long int delta_time, total_delta_time;
	int i;

	if (new_cpu->freq_count > 0) {
	if (!minimal) {
	total_delta_time = 0;
	printf(" ");
	for (i = 0; i < new_cpu->freq_count; i++) {
	delta_time = new_cpu->freqs[i].time - old_cpu->freqs[i].time;
	total_delta_time += delta_time;
	printf("%ukHz %ld", new_cpu->freqs[i].freq, delta_time);
	if (i + 1 != new_cpu->freq_count) {
	printf(" + \n ");
	} else {
	printf(" = ");
	}
	}
	printf("%ld\n", total_delta_time);
	} else {
	for (i = 0; i < new_cpu->freq_count; i++) {
	printf(",%u,%ld", new_cpu->freqs[i].freq,
	new_cpu->freqs[i].time - old_cpu->freqs[i].time);
	}
	}
	}
	}

	/*
	* Determine if frequency stats should be printed.
	*
	* If the frequency stats are different between CPUs, the stats should be
	* printed for each CPU, else only the aggregate frequency stats should be
	* printed.
	*/
	static char should_print_freq_stats() {
	int i, j;

	for (i = 1; i < cpu_count; i++) {
	for (j = 0; j < new_cpus[i].freq_count; j++) {
	if (new_cpus[i].freqs[j].time - old_cpus[i].freqs[j].time !=
	new_cpus[0].freqs[j].time - old_cpus[0].freqs[j].time) {
	return 1;
	}
	}
	}
	return 0;
	}

	/*
	* Determine if the frequency stats should be aggregated.
	*
	* Only aggregate the frequency stats in the total cpu stats if the frequencies
	* reported by all CPUs are identical. Must be called after read_stats() has
	* been called once.
	*/
	static char should_aggregate_freq_stats() {
	int i, j;

	for (i = 1; i < cpu_count; i++) {
	if (new_cpus[i].freq_count != new_cpus[0].freq_count) {
	return 0;
	}
	for (j = 0; j < new_cpus[i].freq_count; j++) {
	if (new_cpus[i].freqs[j].freq != new_cpus[0].freqs[j].freq) {
	return 0;
	}
	}
	}

	return 1;
	}

	/*
	* Print the usage message.
	*/
	static void usage(char *cmd) {
	fprintf(stderr, "Usage %s [ -n iterations ] [ -d delay ] [ -c cpu ] [ -m ] [ -h ]\n"
	" -n num Updates to show before exiting.\n"
	" -d num Seconds to wait between updates.\n"
	" -m Display minimal output.\n"
	" -h Display this help screen.\n",
	cmd);
	}